Information-Centric Networking (ICN) is a common approach to the Internet of the future. However, transitioning to the new Internet architecture right away is impractical if not impossible. Hence, there will be some period of coexistence of ICN and IP. This paper investigates the support of security and privacy features in the three most popular overlay-based ICN/IP coexistence architectures - NDN, PURSUIT, NetInf. The aim is to find out which features are supported and which are not in order to determine which one is more secure and therefore more promising. We analysed these three architectures for the support of availability, access control, data integrity, nonrepudiation, data authentication, anonymity, data confidentiality, and unlinkability. The analysis carried out by the in-depth review of relevant literature shows that NDN and PURSUIT support all eight security and privacy features while NetInf is missing nonrepudiation and does not fully support data authentication. Therefore, NDN and PURSUIT appear to be more secure and hence more promising as an architecture for the Internet of the future.